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twice as much or as many as usual 两倍的；加倍的 a double helping 一客双份的食物 two double whiskies 两杯双份的威士忌酒 a double espresso 双份浓缩咖啡 a double lesson of English 英语两课
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having or made of two things or parts that are equal or similar 双的；成双的；成对的 double doors 双扇门 a double-page advertisement 双页广告 ‘Otter’ is spelt with a double t. otter 一词中有两个 t。 My extension is two four double 0 (2400). 我的分机号是 2400。 a high-profile double murder case 一起引人注目的双重谋杀案 Olympic double gold medallist Mo Farah 奥运会双料冠军莫·法拉
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made for two people or things 供两者用的；双人的 
a double bed/room 双人床；双人房间 a double garage 停放两辆车的车房
Which Word? double / dualdouble / dualThese adjectives are frequently used with the following nouns:compare singledouble ~ dual ~ bed purpose doors function figures role standards approach thickness citizenship - Dual describes something that has two parts, uses or aspects.
dual 描述有两个部分、两种用途或两个方面的事物。 - Double can be used with a similar meaning, but when it is used to describe something that has two parts, the two parts are usually the same or very similar.
double 具有相似的意思，但所描述事物的两个部分通常是相同或相似的。 - Double, but not dual, can describe something that is made for two people or things, or is twice as big as usual.
指供给两人或两事物的东西或较平常大一倍的东西用 double，不用 dual。
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combining two things or qualities 双重的
twice as much/many两倍
with two parts成双
for two people双人
combining two things双重
Word OriginMiddle English: via Old French from Latin duplus, from duo ‘two’ The verb is from Old French dobler, from late Latin duplare, from duplus.
Idioms
do/pull/serve double duty (as something)
to perform two roles or functions at the same time 双双地；成对地 This device can pull double duty as a decent laptop and an adequate tablet. 这款设备可以作为一台像样的笔记本电脑和一台合适的平板电脑发挥双重作用。 She deserves credit for serving double duty as a host and performer. 她作为主持人和表演者的双重职责值得称赞。